Finding the Fourth Proportional to 16,709.05, 23,057.81 and 9,990.71

Step by Step Solution

1. Step 1: Write the proportion equation
   16,709.05 : 23,057.81 = 9,990.71 : x
2. Step 2: Convert to fraction form
   16,709.05/23,057.81 = 9,990.71/x
3. Step 3: Cross multiply
   16,709.05x = 23,057.81 × 9,990.71
4. Step 4: Simplify right side
   16,709.05x = 230,363,777.66
5. Step 5: Solve for x
   x = 230,363,777.66/16,709.05
6. Step 6: Final answer
   x = 13,786.77